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Consolidated K-Series - Condensed Statement of Operations of Consolidated K-Series (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Condensed Income Statements, Captions [Line Items] |  |  |  |
Interest expense | $ 90,223 | $ 78,273 | $ 179,363 | $ 142,740
NET INTEREST INCOME | 17,500 | 15,708 | 37,251 | 29,626
Unrealized gain on multi-family loans and debt held in securitization trusts, net | 12,019 | 1,447 | 19,564 | 2,831
NET INCOME ATTRIBUTABLE TO COMPANY | 29,694 | 14,336 | 59,311 | 33,517
Consolidated K-Series |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Interest income | 85,629 | 75,752 | 170,721 | 137,056
Interest expense | 74,686 | 66,873 | 149,165 | 120,805
NET INTEREST INCOME | 10,943 | 8,879 | 21,556 | 16,251
Unrealized gain on multi-family loans and debt held in securitization trusts, net | 12,019 | 1,447 | 19,564 | 2,831
NET INCOME ATTRIBUTABLE TO COMPANY | $ 22,962 | $ 10,326 | $ 41,120 | $ 19,082

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